US4288058A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite mold for making rubber covered rolls and method for making same
Assignee: RM Engineered Products Inc
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Filing: 1979-09-17
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Granted: 1981-09-08
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Expires: 1999-09-17
Abstract
Abstract A composite cylindrical mold for making rubber covered rolls comprises an outer rigid tube and an inner hollow cylindrical sleeve, with the space between the tube and the sleeve being filled with a cured elastomer. In preparing the mold, a heat shrinkable polytetrafluoroethylene tube etched on the outer surface is disposed around a rigid mandrel and heat shrunk thereon. The mandrel and sleeve are then inserted into the rigid tube in concentric relation. Curable rubber is then injected under pressure between the tube and the sleeve and the rubber is cured, causing the inner surface of the sleeve to conform exactly to the surface of the mandrel. The mandrel is then removed, and the inner surface of the sleeve is used as a molding surface for rubber covered rolls.
Inventors
- 👤 Hubert W. Inman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:44
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/14; B29C45/14778; B29C45/14467; B29C45/14491; B29C45/14598; B29C45/14614; B29C2045/145; B29K; B29K2083/00; B29K2083/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
92 words
A method for making a cylindrical mold comprising the steps of disposing a flexible tube of heat shrinkable polymeric material around a rigid cylindrical mandrel, disposing said tube covered mandrel in concentric relation within a rigid cylindrical shell having an inner diameter greater than the outer diameter of the tube covered mandrel, injecting a curable elastomer under pressure between the tube and the shell until any space therebetween has been filled, curing the elastomer to form a continuous elastomer layer bonded between said shell and said tube, and then removing the mandrel.
Claim 2
Independent Claim
92 words
A method for making a cylindrical mold comprising the steps of disposing a flexible tube of heat shrinkable polymeric material around a rigid cylindrical mandrel, disposing said tube covered mandrel in concentric relation within a rigid cylindrical shell having an inner diameter greater than the outer diameter of the tube covered mandrel, injecting a curable elastomer under pressure between the tube and the shell until any space therebetween has been filled, curing the elastomer to form a continuous elastomer layer bonded between said shell and said tube, and then removing the mandrel.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein said flexible tube is made of a material comprising polytetrafluoroethylene.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein said flexible tube is composed of a heat shrinkable material, and said tube is heat shrunk around said mandrel.
Claim 5
Dependent Claim
69 words
A composite mold having an inner cylindrical molding surface, said mold comprising an outer rigid cylindrical shell, an inner cylindrical tube of flexible material defining said molding surface and being spaced inwardly from the inner surface of said shell, and a layer of flexible cured polymeric material bonded between said shell and inner layer, said polymeric material and said shell serving to support said tube in a cylindrical configuration.
Claim 6
Dependent Claim
69 words
A composite mold having an inner cylindrical molding surface, said mold comprising an outer rigid cylindrical shell, an inner cylindrical tube of flexible material defining said molding surface and being spaced inwardly from the inner surface of said shell, and a layer of flexible cured polymeric material bonded between said shell and inner layer, said polymeric material and said shell serving to support said tube in a cylindrical configuration.
Claim 7
Dependent Claim
12 words
The composite mold to claim 4 wherein said inner tube comprises polytetrafluoroethylene.
Claim 8
Dependent Claim
13 words
The composite mold of claim 5 wherein said polymeric material comprises cured elastomer.
Claim 9
Dependent Claim
14 words
The composite mold of claim 6 wherein said cured elastomer comprises a silicone rubber.
References Cited (Backward Citations)
US2724864A
Cited
US3325434A
Cited
US3355772A
Cited
US3619446A
Cited
US4113825A
Cited
US4098631A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |